One of the secondary structures of protein; Alpha-helix: H bonds are formed between amino acids. The bonds twist the chain of amino acids into a helical shape
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Heterochromatin
Chromatin that is densely packed; Appears dark on EM
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Hexose sugar
Has 6 carbon atoms; E.g. Glucose and Fructose
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Histones
Contained in chromosomes; a protein; Help support and protect DNA when chromatin condenses to form visable chromosomes during nuclear division
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Hydration shells
Water molecules are not free in solution (are surrounding an ion or solute); The more concentrated a solution is, the more negative the water potential is, the more water is bound up in hydration shells and not 'free'
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Hydrocarbon
A compound of hydrogen and carbon
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Hydrogencarbonate
A natural buffer
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Hydrogen ion (H+)
The pH of a solution is an indication of the concentration of H ions in that solution. The more H ions, the more acidic the solution is.
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Hydrolysis reaction
One molecule of water is gained; Addition of water to a bond to break it; Important in the digestion of food; More terminal ends = faster hydrolysis;
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Hydrophilic
'Water loving'; Phospholipids consist of hydrophilic heads (phosphate head); Phosphate head ispolar and soluble in water.
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Hydrophobic
'water-hating'; Fatty acid 'tails' of a phospholipid are hydrophobic; Lipids are hydrophobic and are insoluble in water; Cholesterol is hydrophobic
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Hydrophobic interactions
Involve amino acids whith hydrophobic R-groups; A bond that holds a tertiary protein structure together
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Other cards in this set
Card 2
Front
Helical
Back
One of the secondary structures of protein; Alpha-helix: H bonds are formed between amino acids. The bonds twist the chain of amino acids into a helical shape
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